v1.1.0 for new PWM_manual example, to add function setPWM_DCPercentage_manual() to facilitate the setting PWM DC manually and to catch low frequency error

[khoih-prog]

Releases v1.1.0

1. Add example PWM_manual to demo how to correctly use PWM to generate waveform. Check About DCValue in setPWM_manual #2
2. Add function setPWM_DCPercentage_manual() to facilitate the setting PWM DC manually by using DCPercentage, instead of absolute DCValue depending on varying PWMPeriod
3. Catch low frequency error and use lowest permissible frequency

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This discussion was created from the release v1.1.0 for new PWM_manual example, to add function setPWM_DCPercentage_manual() to facilitate the setting PWM DC manually and to catch low frequency error.